The uses of Cardinol ( Inderal, Dideral, Generic Propranolol ) CARDINOL tablets contain the active ingredient propranolol hydrochloride. CARDINOL belongs to a group of medicines called beta-blockers. It works by changing the body's response to some nerve impulses, especially in the heart. CARDINOL is used to: #lower high blood pressure, also called hypertension #help in the prevention of chest pain (angina) #long-term prevention of future heart attacks #control of most forms of irregular heart beat or rhythm #prevention of migraine headaches #treat certain tremor conditions #treat phaechromocytoma (a rare tumour of the adrenal gland) #control an overactive thyroid gland #certain other heart conditions If you are taking any other medicines, including any you get without a prescription from a pharmacy, supermarket or health food shop, tell your doctor or pharmacist. Medicines that may interfere with CARDINOL include: Insulin and other medications used to treat diabetes Other medicines used to treat high blood pressure; angina or an irregular heart beat including calcium channel blockers eg. Disopyramide, digoxin, clonidine, hydralazine, diltiazem, verapamil, and nifedipine Lignocaine Sympathomimetic agents e.g. adrenalin (used in emergency situations) Cimetidine, a medicine commonly used to treat reflux and ulcers Medicines used in the treatment and prevention of migraines such as ergotamine and ergotamine type compounds Medicines used to treat arthritis, pain or inflammation such as ibuprofen or indomethacin Chlorpromazine, a medicine used to treat psychiatric disorders These medicines may be affected by CARDINOL or may affect how well CARDINOL works. You may need different amounts of your medicines or you may need to take different medicines.